My Tama-Go was Belltchi, and took horrible care of it aiming for Chuchutchi, but I got Shelltchi? I took horrible care of my Shelltchi hoping for Pipotchi, but I got Lovelitchi?
Well here is a list of things to effect your tama character....
Know when they are going to change. (Adult in particular)
When you know they are close to changing... (Hour or so) Check thier hearts.
Now here is the weird part. They have 5 hearts on Hunger and Happniess. The levels are...
Bad, Poor, Okay, Good, Great (Each with a fraction of the hearts covered...)
(Bad 1/5, Poor 2/5, Okay 3/5, Good 4/5, Great 5/5) Both on Hunger anf Happiness.
Now I'm sure you've veiwed a growth chart by now.... Some of them label the care they take. Find one of those and then it will tell you the level of care you need. Fill the hearts to corrispond/match with the "Level Meter" (In Red)
Yes I copied and pasted this... I just didn't feel like re-typing it yet again.